Please read the instructions here on the storepage or on the discord server. But what I can read from the screenshot is that you are trying to load an incompatible save. Season 2 is a new game, which only takes over the decision from the first part, you have to press new game.
since it is a new game does that mean the saves from season 1 would not load in season 2. As I tried to load a season 1 save in season 2 and got that error. Or is the saves still compatible with both seasons as right now I am replaying the game thinking that since I pressed ‘continue’ instead of ‘new game’ I Had corrupted the saves.